Solution-Processed Inorganic Perovskite Flexible Photodetectors with High Performance

• Published in: Nanoscale research letters Vol. 14; no. 1; pp. 284 - 7
• Main Authors: Liu, Ziji, Li, Hao, Qin, Chaojie, Zhang, Ting, Gu, Yiding, Chen, Hao, Zheng, Hualin, Li, Shibin
• Format: Journal Article
• Language: English
• Published: New York Springer US 17-08-2019; Springer Nature B.V; SpringerOpen
• Subjects: Chemistry and Materials Science; CsPbI3-xBrx-based flexible PDs; Environmental stability; Low bias voltage; Low voltage; Materials Science; Mechanical flexibility; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Optoelectronics; Perovskites; Photometers; Variations; Br; Mechanical flexibility; CsPbI; Low bias voltage; Environmental stability; based flexible PDs; CsPbI3-xBrx-based flexible PDs
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-019-3120-x

All inorganic CsPbI
3-x
Br
x
perovskites have been widely used in photodetectors due to their excellent optoelectronic properties and simple preparation processes. Here, high-performance flexible photodetectors based on inorganic CsPbI
3-x
Br
x
perovskites are demonstrated, which are achieved by a modified solution-processed method. When biased at a low voltage of 10 mV, the device yielded fast response speeds (90 μs /110 μs for CsPbI
2
Br PDs and 100 μs/140 μs for CsPbIBr
2
PDs), a high on/off ratio of 10
4
, and a high detectivity about 10
12
Jones. Meanwhile, the devices showed outstanding environmental stability and mechanical flexibility. The periodic I-t curves had negligible fluctuation (< 5%) after storing in air atmosphere for 30 days or bending for 100 times. The results indicate that CsPbI
3-x
Br
x
perovskites have great potential in photodetection areas and pave the way to achieve high-performance flexible PDs.